1. Gravitational waves in non-local gravity.
- Author
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Capozziello, Salvatore and Capriolo, Maurizio
- Subjects
- *
GRAVITY waves , *PLANE wavefronts , *GRAVITY , *GRAVITATIONAL waves - Abstract
We derive gravitational waves in a theory with non-local curvature corrections to the Hilbert–Einstein Lagrangian. In addition to the standard two massless tensor modes, with plus and cross polarizations, helicity 2 and angular frequency ω1, we obtain a further scalar massive mode with helicity 0 and angular frequency ω2, whose polarization is transverse. It is a breathing mode, which, at the lowest order of an effective parameter γ, presents a speed difference between nearly null and null plane waves. Finally, the quasi-Lorentz E(2)-invariant class for the non-local gravity is type N3, according to the Petrov classification. This means that the presence (or absence) of gravitational wave modes is observer-independent. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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